I'm interested in getting a puffer fish but I do not want to put him in my community tank. Can anyone suggest a good puffer for starters that will be OK in a 5G?
You couldnt keep a puffer in a community tank anyway as they are brackish fish and 5g is too small. Ive never kept them myself as Ive never had a brackish tank but Im surer someone will be able to tell you the recommended size tank.
You could keep a single dwarf puffer (Carinotetraodon travancoricus) in a 5 gallon, it would have to be the only occupant. They are completely fresh water and eat snails and other meaty foods.
As emma said, the dwarf puffer will be for you =)
Carinotetraodon travancoricus is the only puffer that can be kept in a 5G tank, and only keep 1 in there. To get more information, do a search on this forums on dwarf puffer and you should find more than enough info.
The Fish Index has a profile on them as well that can be found here: Dwarf Puffer Profile
Not all puffers, far from it, there is many (so far discovered) completely fresh water species.
These can range from needing a simple 5 gallon tank, all the way up to 8 foot + tanks, so quite a big range there! But a lot of people make that mistake, so not to worry.
The Dwarf Puffer (commonly referred to as a DP) is the only puffer which could live permanantly in your 5 gallon. The next freshwater puffer size up is the South American Puffer (commonly referred to as SAP) - collemesus assellus which can live in a 15 gallon tank.